作者: John M. Cioffi , Wonjong Rhee
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摘要: Controlling margins in a DSL modem pair is based on collected operational data. The data analyzed and at least one of the modems instructed to use margin-related parameter value assist meeting margin target, such as limit imposed by standard or like. A controller, DSM Center, 'smart' unit and/or computer system can collect analyze generate more values. may be PSD-related value, MAXNOMPSD, MAXNOMATP PSDMASK used various ADSL systems, shaped spectral mask caps limits bit loading for transmissions between modems. In some cases, preference bands direct favor avoid certain frequencies modem's usable band(s). include historical relating prior performance compliance. distribution also estimated function rate. Using distribution, parameters calculated, including probabilities line outages error exceeding minimum levels. Data rates performance-related set basis using settings